Dear all,
We (Britta+Konrad+myself) have been exploring the subtleties of PCS
guarantees across groups (so not just within a single group). This has
brought up some stark differences between "groups using only pairwise
channels" and the ART/MLS approach.
We wrote up an extended abstract, which is available here:
https://ia.cr/2019/477
We can perhaps discuss this at the interim in Berlin.
(We have more substantial text drafted that we left out for now and
are working towards a full paper.)
Best wishes,
Cas Cremers & Britta Hale & Konrad Kohbrok